Arnold Schwarzenegger's out-of-wedlock son is 13 and the boy's mother has been identified as former housekeeper Mildred Patricia Baena, media reports say.
Several sources, including ABC News, have reported the latest details, which mean that Baena and Schwarzenegger's wife, Maria Shriver, were pregnant at the same time.
The former housekeeper was identified Wednesday in various media. She retired in January after 20 years working for the family.
Baena and her son now live outside of Los Angeles, according to the Canadian Press.
As more details about Schwarzenegger's infidelity and secret son are released, his already tenuous political legacy in California threatens to be completely overshadowed.
The former governor kept the secret during two gubernatorial terms, admitting in a statement early Tuesday that he had fathered the child of a longtime household staff member. He did not name her.
Schwarzenegger and Shriver announced earlier this month that they were separating and that Shriver had moved out, although they did not give a reason at the time beyond a reference to difficult transitions.
Schwarzenegger's story now resembles that of many other philandering politicians, such as former vice-presidential candidate John Edwards.
"There's no political future," said Patrick Dorinson, a Republican who worked on Schwarzenegger's 2003 campaign and in his administration early on. "I'm just disgusted. It's the only dang bipartisan thing these guys do — cheat on their wives. John Edwards, Arnold Schwarzenegger — tell me the difference."
People will remember infidelity, not policies: professor
The indiscretion, which Schwarzenegger referred to as an "event" that occurred more than a decade ago, will be what sticks in the minds of many people, adding to the former Terminator star's image as a Hollywood playboy.
'It's the only dang bipartisan thing these guys do — cheat on their wives. John Edwards, Arnold Schwarzenegger — tell me the difference.' —Patrick Dorinson, former Schwarzenegger campaign worker
"Long after Californians have forgotten the details of his fiscal policies, they'll remember that he had a child out of wedlock. And more importantly, they'll remember the coverup," said Jack Pitney, a political science professor at Claremont McKenna College. "It doesn't necessarily contradict his policies, but it certainly taints his reputation."
Others said the news has a greater impact on Schwarzenegger's family and his friends than it does on California voters.
"I think at the end of the day, it didn't happen during his governorship, it happened before his governorship," said former Senate Minority Leader Jim Brulte, who is now a Republican adviser. "Citizens in California already have a fixed impression of Gov. Schwarzenegger, good or bad, and I would be surprised if this changes that."
Schwarzenegger, a former Mr. Universe who had often bragged about his sexual conquests before he met Shriver, had come under fire just days before the 2003 recall election after the Los Angeles Times reported allegations from 16 women that Schwarzenegger had groped and verbally harassed them during encounters dating to the early 1970s and as recently as 2000. Schwarzenegger apologized for his bad behaviour but never fully addressed the claims.
Shriver was key to helping her husband beat back the allegations and win the 2003 recall election, lending him credibility when she appeared onstage to say that the accusers didn't know her husband.